IBM Informix Dynamic Server 12.10.x / 14.10.x DoS (7238455)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(241366);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/07/04");

  script_cve_id("CVE-2025-1991");
  script_xref(name:"IAVA", value:"2025-A-0463");

  script_name(english:"IBM Informix Dynamic Server 12.10.x / 14.10.x DoS (7238455)");

  script_set_attribute(attribute:"synopsis", value:
"A database server installed on the remote host is affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of IBM Informix Dynamic Server installed on the remote is either 12.10.x prior to 12.10.xC16W2, 14.10.x prior to 14.10.xC11W2. 
It is, therefore, affected by a denial of service vulnerability as referenced in the 7238455 vendor advisory.

  - IBM Informix Dynamic Server 12.10,14.10, and 15.0 could allow a remote attacker to cause a denial of 
    service due to an integer underflow when processing packets. (CVE-2025-1991)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://www.ibm.com/support/pages/node/7238455");
  script_set_attribute(attribute:"solution", value:
"Upgrade to IBM Informix Dynamic Server to the fixed version mentioned in the vendor advisory.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-1991");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/06/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/06/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/07/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:ibm:informix_dynamic_server");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Databases");

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ibm_informix_server_installed.nasl", "ibm_informix_server_installed_nix.nbin");
  script_require_keys("installed_sw/IBM Informix Dynamic Server");
  script_require_ports(139, 445);

  exit(0);
}

include('vcf.inc');
include('smb_func.inc');

var win_local = FALSE;

if (get_kb_item('SMB/Registry/Enumerated')) win_local = TRUE;

var app_name = 'IBM Informix Dynamic Server';
var install = vcf::get_app_info(app:app_name, win_local:win_local);

var ver   = install['version'];
var path  = install['path'];
var fix = NULL;

# For fix 12.10.xC16W2 and 14.10.xC11W2
if (ver !~ "^14\.10\." && ver !~ "^12\.10\.")
  audit(AUDIT_INST_PATH_NOT_VULN, app_name, ver, path);

# https://www.ibm.com/support/pages/ibm-informix-version-number
var item = pregmatch(pattern:"(1[24]\.10).+[cC]([0-9]+)[wW]?([0-9]|$)", string:ver);

if (!empty_or_null(item) && !empty_or_null(item[1]) && item[1] == '12.10')
{
  if (!empty_or_null(item[2]) && (item[2] <= 15 || (item[2] == 16 && empty_or_null(item[3]) || item[3] < 2)))
    fix = '12.10.xC16W2';
}
else if (!empty_or_null(item) && !empty_or_null(item[1]) && item[1] == '14.10')
{
  if (!empty_or_null(item[2]) && (item[2] <= 10 || (item[2] == 11 && empty_or_null(item[3]) || item[3] < 2)))
    fix = '14.10.xC11W2';
}

if (empty_or_null(fix))
  audit(AUDIT_INST_PATH_NOT_VULN, app_name, ver, path);
  
var port = kb_smb_transport();

var report =
  '\n  Path              : ' + path +
  '\n  Installed version : ' + ver +
  '\n  Fixed version     : ' + fix + '\n';

var server_instances = get_kb_item('Host/' + app_name + '/Server Instances');

if (!empty_or_null(server_instances))
{
  var instance_list = split(server_instances, sep:' / ', keep:FALSE);
  report += '  Server instances  : ' + '\n      - ' + join(instance_list, sep:'\n      - ') + '\n';
}

security_report_v4(severity:SECURITY_HOLE, port:port, extra:report);